D641H-1.5 (1.0,0.5) type pneumatic valve straight dust and gas through the use of a pneumatic device to achieve mechanical actuators open and close the disc drive. Disc can be carried out by the working position limit switch signals displayed. The valve can be a single remote control, you can also remote centralized control, electrical signals can also be input computer program. The valve in the non-normal conditions, can be manually operated wrench. Please refer to the valve installed in a horizontal pipe shown in FIG installation when determining the direction to prevent dust accumulation increased valve open resistance.